Hydro acquired in the late 1980s the Mobil service stations in Norway, Sweden and Denmark, changing their name to Hydro. In 1995 Hydro merged its stations in Norway and Denmark with the Texaco, creating the joint venture HydroTexaco. The service station chain was sold in 2006 to Reitangruppen and the stations changed name to YX Energi. In 1999 Hydro acquired Norway's third largest petroleum company Saga Petroleum, who had major upstream operations primarily in Norway and the United Kingdom. The British operations were later sold.
The merger proposal with Statoil was announced in December 2006. Under the rules of the EEA the merger was approved by the European Union on May 3, 2007 and by the Norwegian Parliament on June 8, 2007. The Norwegian Government, the biggest shareholder in both Statoil and Norsk Hydro, holds 62.5% of the company. Jens Stoltenberg, the Prime Minister of Norway commented that he views the merger as "the start of a new era. We are creating a global energy company and strengthening Norway’s oil and gas industry.